InstantBuzz

InstantBuzz is a traffic generating tool that has three main methods of use. The first are Bar Ads, a plugin for IE & FF that adds a toolbar to your browser that displays a small ad. The second is Hyperspace Ads, which are ads that appear as closeable pop ups in the upper right corner of the web pages. The final one is MailSpace ads which appear on the top of sent emails.

I've only used the first two, predominantly the Bar Ads, as they're pretty unobtrusive. Click through rates are pretty low, but I do get some traffic for no effort.

It's free to join, although there are payment options too. You can recruit a downline, but not from the Bar Ads. So far, I've only had one recruit from the limited Hyperspace Ads I've run (one page only on one site).